Sheet-glass edge-forming means



April 8, 1930. L. MAMBOURG sHEE'xQjgLAss EDGE FoRuING MEANS Fn'ed nay 29. 1925 2 Sheets-Sheet Y2 Patented Apr. 8, 1930 UNITED STATES- PATENT OFFICE LEOPOLD MAMBOURG, OF LANCASTER, OHIO, ASSIGNOR T LIBBEY-OWENS GLASS COMPANY, 0F TOLEDO, OHIO, A CORPORATION OF OHIO i SHEET-GLASS EDGE-FORMING MEANS Application led May 29,

The present invention relates to sheet glass apparatus, and has particular reference to sheet glass edge forming means.

An important object of the invention is to provide an apparatus for continuously drawing a sheet of glass from a mass of molten glass, and has particular reference to the provision of sheet edge engaging means for. guiding the edges of the sheet being drawn to pre- ]0 vent narrowing of the said sheet.

Another-object of the invention is to provide a sheet glass drawing apparatus, and means for guiding the edges o the sheet being drawn in a manner to create a beaded edge and to hold the beaded edge past a point where the edge will be sufficiently strong to overcome the natural tendencies of the sheet to contract or narrow.

Still another object ofthe invention is to provide sheet glass edge forming means whereinguide members are arranged at both edges of the sheet and are each provided with a rotatable member for positively advancing glass through the guide means, the same being so shaped as to create a beaded edge.

Other objects and advantages of the invention will become a parent during the course of the following escription.

In the drawings wherein like numerals are employed to designate like parts throughout the same,

Fig. l is a transverse section of a sheet drawing apparatus disclosing my improved construction in use, I

Fig. 2 is a top plan view thereof,

Fig. 3 is a front elevation,

Fig. 4 is a transverse horizontal section through the device,

Fig. 5 is a perspective view of a slightly 4o modified form,

Fig. 6 is a similar view of still another form, and

Fig. 7 is a perspective view of one of the devices.

This invention is particularly well-adapt- 1925. Serial No. 33,708.

ed for use in connection with the Colburn machine set forth in Colburn Patent No. 1,248,809, granted December 4, 1917, wherein. the draw-pot 10 is provided and is ada ted to contain a mass of molten glass 11 rom which a sheet 12 may be drawn. In this patent a sheet of glass is adapted to be defiected over a bending member 13, after which it may be handled in any desirable manner. Y

The Colburn machine utilizes a pair of rotatable knurl rolls at both edges of the sheet which create what is known in the art as a knul-led edge, the said lmurled edge being formed by the rolls for the purposes of preventing or overcoming the natural tendencies of the sheet to narrow. These rolls are placed at the sheet source or meniscus and form a relatively thick heavy edge on the sheet which usually extends seven or eight inches in toward the body of the sheet. When trimming the sheet for commercial purposes, it is necessary to remove this heavy knurled edge and thus the net width of the sheet is considerably less than the gross width.

The aim of the present invention is to provide sheet edge forming devices which will be fully capable of forming an edge on the sheet, while at the same time the amount of edge lass timmed oi will be reduced consideraly.

In Fig. 1 is shown one form of device wherein the guide means 14 are formed in two sections as at 15 and 16 in Fig. 2, each section being supported upon an arm 17 pivotally connected as at 18 and normally urged toward each other by means of the resilient spring 19. `A safety spring 20 is interposed between bosses 21 on respective arms to hold the guide members or shoes 15 and 16 suiciently far apart to permit the edge -22 of the sheet to be formed therein. The arms 17 may be arranged upon any suitable adjustable support 23.-

The shoes 15 and 16 are preferably formed from a noncorrosive metal such as Monel,

- to be positioned beneath the base of the shoe 'molten glass through the said -be adjuste 'sheet being drawn, thus a single strength 'sheet will re uire a more rapid rate of speed 15 and to engage the sheet supplying meniscus 26 in a manner to positively7 advance ide means. The rotatable roll 27 may either blknurled as indicated by the roll 28, or smooth as shown in Fig. 5 and indicated by the numeral'29. The roll is supported upon a shaft 30 which has connection with the driving mechanism 31. The s eed of rotation of the roll can and will vary with the type of of the roll t an the double strength sheet. The rolls may be internally cooled by any suitable means.

As is shown in Fig. 4, one of the guide members 14 is provided with a groove 32 so that a bead 33 will be created on the edges of the glass, and because of the fact that this bead is ulled through the guide means which are coo ed it will be relatlvely more viscous than the balance of the sheet, thus being strong enough to overcome the natural tendencies of the sheetto narrow.

It has been found in the Colburn machine that when usin the knurled rolls a sharp contraction of t e sheet takes place several inches above the knurls. To overcome this noticeable contraction of the sheet with subsequent loss in net width of the finished sheet, the guide shoes 15 and 16 are adapted to contact sufficiently high inthe vertical run of the sheet to permit the edge to gain strength capable of overcoming th1s contraction.

Where the edge is beaded on one side as shown in Fig. 4, it is desirable to have the bead formed on the surface which does not contact with the bending member 13. Of lcourseit is desirable to make the bead 33 as small as possible provided it will prevent 'narrowing of the sheet and thus the bead will not seriously interfere with the bending of the sheet, but at the same time it is better to have the bead on the upper surface of the sheet as has been pointed out.

In Fig. 6 of the drawings both of the guide members 34 and 35 are provided with grooves 36 so that a double bead 37 will be formed. Thus'it will be seen that the construction shown in Fig. 5 will create an L-shaped edge, while the. construction shown in Fig. 6 will create a T-shaped edge. In Fig. 6 the roiencies of contraction.

tatable roll 38, which may or may not be provided with the knurling 39, is provided with a grooved portion 40 which is arranged in alignment with the grooves 36 formed in the guide members. This will insure the introduction of suhcient glass between the guide members to form the beaded edge desired.

In Fig. 7 the guide member is formed in an integral structure, thus forming what may be termed a U-shaped guide member 41.

With the. construction herein set forth the edges of the sheet are held within .a guiding means until they have gained sufficient strength to overcome the natural tend- At the same time the edge formed will be relatively much thinner than the old type of edge formed. There will be no thick portion extending six or seven inches toward the center of the sheet. By overcoming the contraction of the sheet and reducing the thickened portions a much wider net sheet is produced from the same machine than heretofore.

It it to be understood that the form of the Y invention herewith shown anddescribed is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts ma sorted to without departing from t e spirit of the invention or the scope of the subjoined claims.

Claims:

1. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, a stationary guide member arranged at each edge of the sheet, and a rotatable member in horizontal ali ment with a ortion of each guide memIi-iel and cooperating therewith, to assist in advancing glass through said guides. Y

2. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, a stationary guide member arranged at each edge of the sheet, and a rotatable member disposed beneath a portion of saidv guide member and in'horizonvtal alignment with another portion thereof to assist in advancing glass through the stationary guide member.

3. In sheet glass apparatus, a receptacle' containing a mass of molten glass, means for drawing a sheet therefrom, a stationary guide member arranged at each edge of the sheet, and a rotatable member in vertical alignment with one portion of said guide member and in horizontal alignment with another portion thereof, said rotatable member cooperating with the second mentioned portion of the guide member to assist in advancing glass therethrough.

4. In sheet glass-apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, guide means arranged at both edges of the sheet, and a roll associated with each guide means, each roll be rebeing in horizontal alignment with a portion of its respective guide member and adapted to cooperate therewith for assisting in advancing glass therethrough.

5. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, a width maintaining device disposed at each edge of the sheet, each width maintaining device comprising two sections, and a rotatable member -arranged beneath one of said sections and adapted to cooperate with .the lower portion of the other section in a manner to assist in advancing glass through said .width maintaining device.

6. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, a width maintaining device disposed at each edge of the sheet, each width maintaining device `comprising two sections, one section being formed at its lower; edge to substantially conform to the natural curvature of the sheet source, the other section terminating in spaced relation to the sheet source, and a rotatable member mounted between the lower edge of the second mentioned section and the sheet source.

7. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, a stationary cuide member arranged at each edge of the heet, and a rotatable member in horizontal `ilignment with a portion of each guide memver and cooperating therewith to assist in f advancing glass through said guides, said guide means being shaped to form beaded edges on the sheet being drawn.

8. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, a stationary guide member arranged at each edge of the sheet, and a rotatable member in horizontal alignment ith a portion of each guide mem ber and cooperatlng therewith to assist in advancing glass through said guides, the guide members being of suiiicient height to v engage the sheet edges past a point where they will be sufficiently strong -to resist the natural tendency of the sheet to contract.

9. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, slotted guide means arranged at both edges of the sheet, and a single roll associated with each slotted guide means, each roll cooperating in substantially horizontal alignment witha portion of its respective guide means to assist in advancing the glass through said guide means arranged at both edges of the sheet,

and a single roll associated with each slotted. guide means, each roll cooperating in substantially horizontal alignment with a portion of its respective guide means to assist in advancing the glass through said guide means, the guide means being formed to encontaining a mass of molten glass, means lfor drawing a sheet therefrom, Aslotted guide means arranged at both edges. of the sheet, said guide means having one side shorter than the other, and rotatable means disposed beneath the shorter side for assisting in advancing glass to the border portions of the sheet.

12. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, slotted guide means arranged at both edges of the sheet, said guide means having one side shorter than the other, rotatable means disposed beneath the shorter side for assisting in advancing glass to the border portions of the sheet, and means for lowering the tempera ture of the guide means.

13. In sheet glass apparatus, a receptacle y said guide means having one side shorter y than the other, and rotatable means disposed beneath the shorter side for assisting in advancing glass to the border portions ofthe sheet, said guide means being shaped to form beaded edges on the sheet being drawn.

14. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, slotted guide means arranged at both edges of the sheet, and a single knurled roll associated with each slotted guide means, each roll cooperatin in substantially horizontal alignment wit a portion of its respective guide means to assist in advancing the glass through said guide means.

15. In sheet glass apparatus, a receptacle containing a mass of molten glass, means for drawing a sheet therefrom, slotted guide means arranged at both edges of the sheet, and a single roll associated with each slotted guide means, each roll cooperating in substantially horizontal alignment with a portion of its respective guide means to assist in advancing the glass through said guide means, the guide means being formed to engage the sheet edges past a point where they will be sufficiently strong to resist the natural tendency vof the sheet to contract, the guide means being shaped to createfgfbeaded edges on the sheet.

16. In sheet glass apparatus, a receptacle containing a mass of molten lass, means for drawing a sheet therefrom, s otted means ar-` ranged at both edges of the sheet and disposed above the surface of the glass from .which the sheet is drawn, one side of said guide means havin one end arranged relatively close to the ase of the sheet and the other side of said guide means being so disposed that a roll may be arranged between the lower end thereof and the surface of the molten glass to assist in advancing the molten glass through the said guide means.

Signed at Lancaster, in the county of Fairfield, and State of Ohio, this 25th day of May,

LEOPOLD MAMBOURG. 

